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Ecotoxicological information

Toxicity to terrestrial arthropods

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Description of key information

A study in Porcellio scaber with sodium fluoride showed effects only at high concentrations. Similarly based on the read across justification, calcium difluoride is expected to only show effects at high concentrations.

Key value for chemical safety assessment

Long-term EC10, LC10 or NOEC for soil dwelling arthropods:
1 642 mg/kg soil dw

Additional information

The effects of fluoride concentration were investigated on the numbers of Porcellio scaber in leaf litter. Leaf litter was collected from eight sites at various distances away from an aluminium reduction plant. Results showed that litter collected far from the plant had a lower fibre content, was more sapric and was less acid. Total acid extractable fluoride in the litter and upper 15 cm of soil was about 41 times as much at the closest site (700 mg/kg) as at the most distant sites (12 and 16 mg/kg). In a bioassay of litter from study sites, woodlice (Porcellio scaber) had an abnormally high mortality in litter that contained 440 mg/kg or more of acid extractable fluoride. When fluoride was added in the form of NaF to the litter, a significant increase in mortality was observed only in treatments exceeding 800 mg/kg (Beyer et al, 1987).

Similarly based on the read across justification, calcium difluoride is expected to only show effects at high concentrations.